You are obviously exaggerating there. Fedora does not prompt for reboot on all updates at all. Only when the package maintainer has explicitly marked that a update requires a reboot. This includes major components like the kernel.

Fedora does get more updates because unlike some other distributions which only push out security and bug fixes, Fedora also pushes new upstream releases often. You can choose to get only security/bug-fix updates via PackageKit or yum easily however.